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//===-- Unittests for str_to_float<long double> ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/__support/macros/config.h"
#include "str_to_fp_test.h"
#include "src/__support/integer_literals.h"
namespace LIBC_NAMESPACE_DECL {
using LlvmLibcStrToLongDblTest = LlvmLibcStrToFloatTest<long double>;
using LIBC_NAMESPACE::operator""_u128;
#if defined(LIBC_TYPES_LONG_DOUBLE_IS_FLOAT64)
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat64AsLongDouble) {
eisel_lemire_test(123, 0, 0x1EC00000000000, 1029);
}
#elif defined(LIBC_TYPES_LONG_DOUBLE_IS_X86_FLOAT80)
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat80Simple) {
eisel_lemire_test(123, 0, 0xf600000000000000, 16389);
eisel_lemire_test(12345678901234568192u, 0, 0xab54a98ceb1f0c00, 16446);
}
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat80LongerMantissa) {
#if __SIZEOF_LONG_DOUBLE__ == 16
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, 0,
0x91a2b3c091a2b3c1, 16507);
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, 300,
0xd97757de56adb65c, 17503);
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, -300,
0xc30feb9a7618457d, 15510);
#elif __SIZEOF_LONG_DOUBLE__ == 12
eisel_lemire_test(0x12345678'12345678'12345678_u96, 0, 0x91a2b3c091a2b3c1,
16475);
eisel_lemire_test(0x12345678'12345678'12345678_u96, 300, 0xd97757de56adb65c,
17471);
eisel_lemire_test(0x12345678'12345678'12345678_u96, -300, 0xc30feb9a7618457d,
15478);
#else
#error "unhandled long double type"
#endif
}
// These tests check numbers at the edge of the DETAILED_POWERS_OF_TEN table.
// This doesn't reach very far into the range for long doubles, since it's sized
// for doubles and their 11 exponent bits, and not for long doubles and their
// 15 exponent bits. This is a known tradeoff, and was made because a proper
// long double table would be approximately 16 times longer (specifically the
// maximum exponent would need to be about 5000, leading to a 10,000 entry
// table). This would have significant memory and storage costs all the time to
// speed up a relatively uncommon path.
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat80TableLimits) {
eisel_lemire_test(1, 347, 0xd13eb46469447567, 17535);
eisel_lemire_test(1, -348, 0xfa8fd5a0081c0288, 15226);
}
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat80Fallback) {
// This number is halfway between two possible results, and the algorithm
// can't determine which is correct.
ASSERT_FALSE(internal::eisel_lemire<long double>({12345678901234567890u, 1})
.has_value());
// These numbers' exponents are out of range for the current powers of ten
// table.
ASSERT_FALSE(internal::eisel_lemire<long double>({1, 1000}).has_value());
ASSERT_FALSE(internal::eisel_lemire<long double>({1, -1000}).has_value());
}
TEST_F(LlvmLibcStrToLongDblTest, ClingerFastPathFloat80Simple) {
clinger_fast_path_test(123, 0, 0xf600000000000000, 16389);
clinger_fast_path_test(1234567, 1, 0xbc61460000000000, 16406);
clinger_fast_path_test(12345, -5, 0xfcd35a858793dd98, 16379);
}
#elif defined(LIBC_TYPES_LONG_DOUBLE_IS_FLOAT128)
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat128Simple) {
eisel_lemire_test(123, 0, 0x1ec00'00000000'00000000'00000000_u128, 16389);
eisel_lemire_test(12345678901234568192u, 0,
0x156a9'5319d63e'18000000'00000000_u128, 16446);
}
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat128LongerMantissa) {
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, 0,
0x12345'67812345'67812345'67812345_u128, 16507);
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, 300,
0x1b2ee'afbcad5b'6cb8b445'1dfcde19_u128, 17503);
eisel_lemire_test(0x12345678'12345678'12345678'12345678_u128, -300,
0x1861f'd734ec30'8afa7189'f0f7595f_u128, 15510);
}
TEST_F(LlvmLibcStrToLongDblTest, EiselLemireFloat128Fallback) {
ASSERT_FALSE(internal::eisel_lemire<long double>(
{0x5ce0e9a5'6015fec5'aadfa328'ae39b333_u128, 1})
.has_value());
}
TEST_F(LlvmLibcStrToLongDblTest, ClingerFastPathFloat128Simple) {
clinger_fast_path_test(123, 0, 0x1ec00'00000000'00000000'00000000_u128,
16389);
clinger_fast_path_test(1234567, 1, 0x178c2'8c000000'00000000'00000000_u128,
16406);
clinger_fast_path_test(12345, -5, 0x1f9a6'b50b0f27'bb2fec56'd5cfaace_u128,
16379);
}
#else
#error "Unknown long double type"
#endif
} // namespace LIBC_NAMESPACE_DECL
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